Method for damaging interbed near horizontal well

Abstract

The invention provides a method for damaging an interbed near a horizontal well. The method comprises the following steps that a first horizontal well and a second horizontal well are arranged, one of the first horizontal well and the second horizontal well is a steam injection well, and the other one of the first horizontal well and the second horizontal well is a producing well; steam is injected into the first horizontal well and the second horizontal well simultaneously and liquid is drained according to a first predetermined rule; liquid draining of the first horizontal well is stopped, and the first horizontal well is shut for soaking, so that steam in the first horizontal well forms liquid flow with the temperature lower than the steam temperature after the steam condenses, and accordingly, a low pressure area is formed in the first horizontal well; and steam is injected into the first horizontal well again according to a second predetermined rule, so that the steam is made to fast flow to the low pressure area and push the liquid flow to form surges in the first horizontal well, the surges mutually impact to generate impact waves, and the interbed near the first horizontal well is damaged consequently. According to the method for damaging the interbed near the horizontal well, the pressure impact waves can be generated locally, interbed rock near the horizontal well can be impacted, and the effect that the interbed rock between the wells and the interbed rock above the steam injection well are damaged is achieved.

Description

technical field [0001] The application belongs to the technical field of petroleum exploitation, and in particular relates to a method for destroying an interlayer near a horizontal well. Background technique [0002] At present, SAGD (Steam-Assisted Gravity Drainage) is one of the effective and economic means of producing super heavy oil. The basic principle of SAGD is to inject steam into the oil layer from the injection well, and heat the deep part of the oil reservoir through the heat conduction between steam and heavy oil. After the heavy oil is heated, the viscosity drops significantly, and it will be released into the production well together with the condensed water under the action of gravity. With the continuous extraction of crude oil, the injected steam moves upward and laterally, and the steam chamber gradually expands. [0003] However, in the reservoirs developed by SAGD at home and abroad, the problem of interlayers is common. Such as figure 1 As shown, t...

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Problems solved by technology

[0003] However, in the reservoirs developed by SAGD at home and abroad, the problem of interlayers is common.

like figure 1 As shown, the appearance of interlayer rocks severely restricts the vertical expansion of the steam chamber, the drainage of heated crude oil, and the balanced development of the steam chamber, which leads to the disadvantages of low oil-gas ratio and low oil production rate when SAGD develops reservoirs with interlayers. situation

Especially the interlayer rock near the wellbore greatly restricts the rapid development of the steam chamber to the top, delaying the arrival of the peak production

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